Bridgeport’s harbor and nearby airport in Stratford would be upgraded under a transit-infrastructure proposal by Republican gubernatorial hopeful David Stemerman of Greenwich.

Stemerman, who closed a multi-billion-dollar hedge fund to seek the governor’s office, would establish public private partnerships throughout the street to bring in new projects, such as the widening of interstate highways, on time and on budget.

In a 16-page outline issued Tuesday, Stemerman promised a 45-minute train ride to New York City, an expansion of Sikorsky Memorial Airport in Stratford, a “free-flowing” Interstate-95 and high-speed ferry service to Manhattan for a possible new resort casino proposed for Bridgeport.

“Airport privatization and expansion projects are almost always self-financing by the private company that operates them through a combination of landing fees, passenger facility charges and revenues generated by services at the airport,” says his plan.

“We can get our highways flowing again to improve access to our rural and small towns,” Stemerman said. “We will put our people back to work in construction projects that will law the foundation to revitalize our state.”

During a Tuesday interview, Stemerman said he has consulted bankers, planners, investors and construction professionals in developing his proposed strategy to restore the Connecticut’s infrastructure. If that succeeds, the health of the state’s major cities will improve accordingly. He announced some of the initiatives Monday night during a candidates’ forum sponsored by Connecticut Realtors in New Haven.